Chuck for rock drills



A. H. KATTERJOHN 28 2 Sheets-Shee l Ap 1- A. H. KATTERJOHN Filed May 3, 1928 ZShGetS-ShGB! 2 Fatentecl Apr. 14,

,1 "f-IJ NIris!) STATES .nuetsm H. xnrrnnaronmor DENVER, COLORADO, Assrenon 'ro GARDNER-DENVER COMPANY, or nmrvnngootoitnno, A conrom'rron'ior DELAWARE.

annex Eon. nocx DRILLS Application filed. m a, 1928. SeriaI n6. 274,767.

The present invention relates to chuck structures for rock drills and like tools, the

object being to provide an effective steel holder having a long bearing and yet permitting 5 easy introduction and removal of the 'lugged part of the steel. 7

' Inthe' accompanying drawings:

Figure 1 is a longitudinal sectional view through a such structure embodying the presentinvention. r

Figures 2, 3, 4 and 5 are sectional views respectively on the correspondingly numbered lines of section of Figure 1.

Figure 6 is a longltudinal sectional View 15 through a slightly modified form of structure.

Figure 7 is an end elevation of the sleeve.

Figure 8 is aside elevation of the front end portion thereof.

Figure 9 is a cross sectional view on the line 9-9 of Figure 6.

In the embodiment disclosed, a chuck housing 10 is employed fitted on to the front end of the usual cylinder bushing 11. In the housing and bushing is rotatably mounted a sleeve 25 12having at its end a nut 13 that is in splined engagement with the hammer piston indicated at 14. j e I The sleeve is provided between its ends and in advance of the nut 13 with an internal rib or flange 15 forming a front abutment shoulder 16. Into said front end of the sleeve is securely pressed a bushing 17 constituting a bearing for the rear end, 18 of the steel 19. This steel is provided with the usual lugs 20. A chuck member 21 is located in the housing in advanceof the sleeve 12 and is interlocked therewith by interfitting teeth portions 22 at their adjacent ends. This chuck housing has a reduced front end 23 that extends through an inturned flange 24: formed on the front end of the housing, and constituting a retainer for the chuck member 21. i

The chuck member 21 has an internal cham-- ber 25 for the reception of the lugs of the steel and the front wall of said chamber is 7 provided with a bore 26 for the passage of the steel and oppositely disposed passageways 27 that permit the entrance of the lugs into the chamber 25. By reference to Figure 2, it will be noted that the walls of the bore 26 between the passageways 27 constitute bear- 1ngs for the steel 19. In the rear portion of the chamber are the usual abutment lugs 28 for the steel lugs 20 (see Figure 5) andthe innerends of these lugs constitute bearings 29 for the steel. Between the lugs 28 and the front wall 23 there are other bearing lugs 30f that engage opposite sides of the steelfas shown in Figures 3, and 4, these lugsbeing spaced apart to'provide, passageways' 31 for the lugs of the steel. It'will be noted by a comparisonof Figures 2' and 3that the bear;

ings 26 of the front wall 23 and the bearings" of vthe lugs 30 are at right 'angles and that the bearings 29 of the lugs 28 are in a differ-- ent relation from either of the foregoing.

As a consequence, it will be evident'that' a very long bearing is providedffor the shank of the tool. r

In Figures 69'inclusive, a slightly modified formofconstruction is shown. In this embodiment, thehousing is designated 32' and contains a sleeve 33 having a nut 35L in'its rear end for splined engagement with the hammerposition. The sleeve in this instance is provided near its front end with a shoulder 35 against which is pressed into the sleeve from the rear, a bushing 36.- Interposedbe tween the'nut'34 and bushing 36 is a spacing sleeve 37. The chuck member is designated 38 and isinterfitted atits rear end with the front of the sleeve 32 as shown at 39. The

frontwall of said chuck member 40 is pro-- vided with 'abearing 41 forthe shank of the tool 42-;"a nuis;of; the same formation as shown-in Figure 2. The abutment: lugs for the steel lugs l3 are in this structure formed,"

in the front end fof the' sleeve at445,fwhile bearing lugs 15 corresponding to the lugs 30 of the first described structure areinterpose'd between, the front wall 40 and the bearing lugs 14. This-structureobviously secures the same long bearing andyet permits the ready insertion of'the' tool into'the chuck andits removal therefrom j while maintaining it against accidental displacement. 5

From the foregoing, 1t was thought that 2. n 1,800,390 I 1 I further description, and it Will be understood that various changes in the size, shape, proportion and minor details of construction may be resorted to Without departing from the spirit or sacrificing any of the advantages of the invention.

What ?'.I -c1aim,is a, 1. The combination With a housing, of a sleeve therein, a bearing bushing pressed into the sleeve, and a rotatable chuck member .in

advance of;the.sleeve having a plurality of relatively fixed bearings Within the same spaced apart and at different points along its length for engagement with a lugged tool at different distances from'the lugs thereof in dvance thereof. Y r h. V

.2. The combination with a, housing, of a rotatable chuck thereinhaving a; chamber for receiving the lugged endiof a steel and .hav-

1 ring ahutinellts forthelugs thereof, said chamher having a front hearing for the steel, and hearings: ,in the chamber between the front; bearing and ithelllg abutments and spaced frorn'both.

' The combination with a housing, of a rotatable-chuck therein having azchamber for receivingthe lugged-endofa steel and having abutments for the lugsthereof, said chamber having a front bearing for .thesteel, spaced bearing lugs in the chamber betweenthe front for vtheifsteel and having passageways for lthe entrance ref the lugs "of the-steel, into the hamber, ahutments at-the'rear end of the chamber for thelugs, and spaced bearing lugs to turn between them after passing the front Wall to pass the bearing lugs to engage;

the ab-utments.

6. The combination With a housing, of a rotatable chuck therem having a chamber for receiving ,the lugged end of a steel andhaving'ahutments fer-th lugsth reqf saidchu k having a front Wall provided W1th a bore to form a bearing for the steel and having passageways :to permit "the entrance of the lugs .to the chamber, said chuck having bearing lugs in the chamber thatare behindand sub- 'stantiall-y in l ine With the passageways of the front Wall, said bearing lugs being spaced fromthe frontwall suificiently to permit the lugs in the ehamherihetween the front wall and. abutments and adapted to b ar against the steehsaidbear ng legs being spacedfrem hetahutmentsandfrem the front-wall a-disa tense suflieient to .permit the passage therebetWeencf-the-lngs of'such steel.

,5. The combination with a hQ lSi11%,. Qf a rotatable'.chuck:thereinihaving-areham er-for reeeiving he luggedend of a steeland havin i abutments for the lugs thereof, said chue havingafront Wall; rovided With-a bore to form a bearingtfer t esteel-and having-passageways to permit the entrance oftheglugsto the chamber, said chuck having bearinglugs in the chamber that are ,behind andysubstanially in vline ;with [the pas age ays .of th front Well, said hearing hlge be ng spaced "flan 

